CVE-2023-5980: BSK Forms Blacklist < 3.7 - Admin+ Stored Cross-Site Scripting

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-12-26 · updated 2026-06-17
Weakness: CWE-79

Description

The BSK Forms Blacklist WordPress plugin before 3.7 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).

Affected products

BannerSky BSK Forms Blacklist: before 3.7 — fixed in 3.7

How to fix

Upgrade to a fixed version: BannerSky BSK Forms Blacklist 3.7. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/b621261b-ae18-4853-9ace-7b773810529a
https://wpscan.com/vulnerability/b621261b-ae18-4853-9ace-7b773810529a

Get alerted when CVE-2023-5980 or the next vulnerability affects your stack